An amplification device configured for amplifying a signal with a DC signal component is provided, which comprises a coupling filter circuit having an input terminal and an output terminal. The coupling filter circuit attenuates the DC signal component of an input signal to obtain a filtered output signal. The coupling filter circuit comprises a first capacitor circuit connecting the input terminal to the output terminal; a second capacitor circuit connected in parallel to the first capacitor circuit, a first resistor and a second resistor, wherein the second capacitor, the first resistor and the second resistor are serially connected; and a resistor circuit connected to the input terminal and the output terminal and comprising a third resistor connected to the input terminal and a fourth resistor connected to the output terminal. The amplification device comprises an amplification circuit connected to the output terminal, which amplifies the filtered signal.
Legal claims defining the scope of protection, as filed with the USPTO.
1. An amplification device configured for amplifying a signal, the amplification device comprising: a coupling filter circuit having an input terminal for receiving an input signal and an output terminal for outputting a filtered output signal, wherein the coupling filter circuit is configured to at least attenuate a DC signal component of the input signal to obtain the filtered output signal, wherein the coupling filter circuit comprises a first capacitor circuit connecting the input terminal to the output terminal, the first capacitor circuit comprising a first capacitor; a second capacitor circuit connected in parallel to the first capacitor circuit, the second capacitor circuit comprising a second capacitor, a first resistor and a second resistor, the second capacitor, the first resistor and the second resistor being serially connected; and a resistor circuit connected to the input terminal and the output terminal, the resistor circuit comprising a third resistor connected to the input terminal and a fourth resistor connected to the output terminal; an amplification circuit connected to the output terminal, the amplification circuit being configured to amplify the filtered output signal to obtain an amplified filtered signal; and a further coupling filter circuit, wherein the further coupling filter circuit comprises a further input terminal for receiving an inverted version of the input signal and a further output terminal for outputting a further filtered output signal, and wherein the coupling filter circuit has an electrical bandpass characteristic.
2. The amplification device according to claim 1, wherein the second capacitor circuit is connected in parallel to the first capacitor of the first capacitor circuit.
3. The amplification device according to claim 1, wherein the first capacitor circuit is composed only of the first capacitor.
4. The amplification device according to claim 1, wherein the second capacitor is connected between the first resistor and the second resistor, the first resistor being directly connected to the input terminal, the second resistor being directly connected to output terminal.
5. The amplification device according to claim 4, wherein the second capacitor circuit is composed only of the second capacitor, the first resistor and the second resistor.
6. The amplification device according to claim 1, wherein at least one of the following is true: the third resistor of the resistor circuit is arranged to couple the input terminal to a reference potential or the fourth resistor of the resistor circuit is arranged to couple the output terminal to the reference potential.
7. The amplification device according to claim 1, wherein the amplification circuit comprises or is formed by a field effect transistor having a gate terminal, wherein the output terminal is connected to the gate terminal.
8. An amplification device configured for amplifying a signal, the amplification device comprising: a coupling filter circuit having an input terminal for receiving an input signal and an output terminal for outputting a filtered output signal, wherein the coupling filter circuit is configured to at least attenuate a DC signal component of the input signal to obtain the filtered output signal, wherein the coupling filter circuit comprises a first capacitor circuit connecting the input terminal to the output terminal, the first capacitor circuit comprising a first capacitor; a second capacitor circuit connected in parallel to the first capacitor circuit, the second capacitor circuit comprising a second capacitor, a first resistor and a second resistor, the second capacitor, the first resistor and the second resistor being serially connected; and a resistor circuit connected to the input terminal and the output terminal, the resistor circuit comprising a third resistor connected to the input terminal and a fourth resistor connected to the output terminal; an amplification circuit connected to the output terminal, the amplification circuit being configured to amplify the filtered output signal to obtain an amplified filtered signal; and a further coupling filter circuit, wherein the further coupling filter circuit comprises a further input terminal for receiving an inverted version of the input signal and a further output terminal for outputting a further filtered output signal, and wherein the coupling filter circuit comprises integrated capacitors according to a metal-insulator-metal technology.
9. The amplification device according to claim 1, comprising a further amplification circuit, arranged downstream the further coupling filter circuit.
10. The amplification device according to claim 1, further comprising: a further first capacitor circuit connecting the further input terminal to the further output terminal, the further first capacitor circuit comprising a further first capacitor; a further second capacitor circuit connected in parallel to the further first capacitor circuit, the further second capacitor circuit comprising a further second capacitor, a further first resistor and a further second resistor, the further second capacitor, the further first resistor and the further second resistor being serially connected; and a further resistor circuit connected to the further input terminal and the further output terminal, the further resistor circuit comprising a further third resistor connected to the further input terminal and a further fourth resistor connected to the further output terminal, wherein the third resistor of the resistor circuit and the further third resistor of the further resistor circuit are electrically connected, and the coupling filter circuit is connected to the further coupling filter circuit.
11. The amplification device according to claim 10, wherein the third resistor and the further third resistor are electrically connected at a connection point, wherein the amplification device comprises a shunting capacitor connecting the connection point to a reference potential.
12. The amplification device according to claim 11, further comprising a diode circuit comprising a first diode and a second diode, the first diode and the second diode being connected antiparallel to each other in an antiparallel diode circuit that connects the connection point to a reference potential.
13. The amplification device according to claim 1, wherein the respective input terminal is connected via a shunt resistor to a reference potential.
14. The amplification device according to claim 8, wherein the second capacitor circuit is connected in parallel to the first capacitor of the first capacitor circuit.
15. The amplification device according to claim 1, wherein the coupling filter circuit comprises integrated capacitors according to a metal-insulator-metal technology.
16. An optical receiver, comprising: an amplification device, wherein the amplification device comprises: a coupling filter circuit having an input terminal for receiving an input signal and an output terminal for outputting a filtered output signal, wherein the coupling filter circuit is configured to at least attenuate a DC signal component of the input signal to obtain the filtered output signal, wherein the coupling filter circuit comprises a first capacitor circuit connecting the input terminal to the output terminal, the first capacitor circuit comprising a first capacitor; a second capacitor circuit connected in parallel to the first capacitor circuit, the second capacitor circuit comprising a second capacitor, a first resistor and a second resistor, the second capacitor, the first resistor and the second resistor being serially connected; and a resistor circuit connected to the input terminal and the output terminal, the resistor circuit comprising a third resistor connected to the input terminal and a fourth resistor connected to the output terminal; an amplification circuit connected to the output terminal, the amplification circuit being configured to amplify the filtered output signal to obtain an amplified filtered signal; and a further coupling filter circuit, wherein the further coupling filter circuit comprises a further input terminal for receiving an inverted version of the input signal and a further output terminal for outputting a further filtered output signal, and wherein the amplification device comprises: a further first capacitor circuit connecting the further input terminal to the further output terminal, the further first capacitor circuit comprising a further first capacitor; a further second capacitor circuit connected in parallel to the further first capacitor circuit the further second capacitor circuit comprising a further second capacitor, a further first resistor and a further second resistor, the further second capacitor, the further first resistor and the further second resistor being serially connected; and a further resistor circuit connected to the further input terminal and the further output terminal, the further resistor circuit comprising a further third resistor connected to the further input terminal and a further fourth resistor connected to the further output terminal, wherein the third resistor of the resistor circuit and the further third resistor of the further resistor circuit are electrically connected at a connection point, and the coupling filter circuit is connected to the further coupling filter circuit, and wherein the amplification device comprises a shunting capacitor connecting the connection point to a reference potential; and a converter being configured to convert an optical signal into an electrical signal.
17. The amplification device according to claim 6, wherein the reference potential is a ground potential.
18. The amplification device according to claim 9, wherein the further amplification circuit comprises a further field effect transistor.
19. The amplification device according to claim 13, wherein the reference potential is a ground potential.
20. The amplification device according to claim 1, wherein the respective coupling filter circuit has a lower cut-off frequency being equal to 300 kHz with a tolerance range of +/−5% or +/−10%.
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March 8, 2022
June 17, 2025
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